OAKLAND — A 19-year-old San Pablo man died early Saturday when his car struck a cement barrier as he fled police who broke up speed contests and “sideshow” activities in the Middle Harbor area of the Port of Oakland.

A passenger in the car, a 17-year-old Richmond resident, was treated at Highland Hospital for injuries, Oakland police said. The dead man was not identified immediately, pending notification of next of kin. The death was the latest in a series of violent incidents as sideshows have moved into the harbor area from East Oakland. Two weeks ago, two brothers were slain by someone watching drag racing.

Last weekend, a vehicle participating in a sideshow was struck by a big rig as it left the port area, injuring several occupants of the vehicle.

Oakland police said they intend to meet with Port of Oakland officials this week to see what can be done to alleviate the situation. Drag racing and sideshows draw many out-of-town participants and often dozens of cars are involved, officers said.

According to Oakland traffic officers Vinton W. Johnson and Randy Pope, the vehicle in the chase early Saturday, a blue Honda Prelude, sped away without headlights at a high rate of speed from a drag race at 2:50 a.m. when the California Highway Patrol arrived. The CHP gave chase. The driver of the Honda failed to negotiate a curve as it approached the intersection of Third and Adeline streets. The car struck the cement barrier, then rolled over at least once.

Sgt. Wayne Ziese, of the CHP, said patrol units discovered a street race near Middle Harbor Road and Seventh Street. He estimated that about 20 high-performance, import cars fled.

Anyone with information involving the crash and death is asked to call the Oakland Police traffic division at 238-3156.